How I managed to set up a Fixed Background and all the other elements scrolling up over it.
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I set an Image straight on the page as per screenshot 1 and filled with the picture I wanted.
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Next, I set the settings for this Image as per the following two screenshots:
Both figures of the Aspect Ratio will need changing to cause the image to fill the whole page. -
Finally, I darkened the Image using the Image Filters settings to set the Brightness to the dark level I wanted for lighter coloured text flowing over it.
Hope this might help someone else.